Quantum Physics2026-01-011 minarXiv:2601.00198expressHeat Flows BackwardWater in a glass cools, ice melts, and a kettle heats the stove: that's how the world works: heat always flows from hot to cold. This is the second law of thermodynamics, a law that has never been broken.Keyi Huang·Qi Zhang·Xiangjing Liu·Ruiqing Li·Xinyue Long·Hongfeng Liu·Xiangyu Wang·Yu-ang Fan·Yuxuan Zheng·Yufang Feng·Yu Zhou·Jack Ng·Xinfang Nie·Zhong-Xiao Man·Dawei Lusecond law of thermodynamicslaw of conservation of energyLudwig BoltzmannRudolf ClausiusAlbert Einsteinquantum thermodynamicstemperatureentropyinternal energythermal conductivity👍👎☆SimplePopularAdvanced